in attendance at the vatican, vice president joe biden led the american delegation along with political and religious leaders from around the world. pope francis bowed and prayed at the tomb of st. peter. and afterward received a simple woolen pallium and fisherman's ring placed on his right finger and we heard some of pope francis' familiar themes. >> translator: an embrace with tender affection the whole of humanity. especially the poorest, the weakest, the least important. >> reporter: and the crowd estimated to be up to 200,000 people strong and they watched this inaugural mass on large screen televisions. monitors scattered all over st. peter's square. we're also learning more about someone else who watched this very special event, pope emeritus benedict, italian media reported he watched from the comforts of his own home on television. robin? >> good for him. such a special morning. thank you so much. >>> back here at home the frightening and potentially deadly plot foiled at the university of central florida. police revealing that guns and explosives were found in a student's dor